The str Method: You Decide What print Shows

What makes `print(c)` show `<3,4>` instead of `<__main__.Coordinate object at 0x7f9c...>`?

Finger exercises

Short drills on what this video just taught. Write the code, run the checks, and reveal the answer only if you are stuck.

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Exercise 1 of 5

You decide what `print` shows

Coordinate below is the class from the video, except that its __str__ still hands back an empty string, so printing a coordinate shows nothing at all.

Fill that body in so a coordinate is represented as an opening angle bracket, its x value, a comma, its y value, and a closing angle bracket — with nothing else in between. Leave the rest of the class exactly as it is. Recall that self.x holds an int and that str() casts a value to a string; an f-string does the job just as well.

class Coordinate(object):
    """ A coordinate made up of an x and y numerical value """

    def __init__(self, x, y):
        """ Sets the x and y values """
        self.x = x
        self.y = y

    def distance(self, other):
        """ Returns the euclidean distance between two Coordinate objects """
        x_diff_sq = (self.x - other.x) ** 2
        y_diff_sq = (self.y - other.y) ** 2
        return (x_diff_sq + y_diff_sq) ** 0.5

    def __str__(self):
        """ Returns the string print should show for this coordinate """
        # Build and return that string.
        return ""  # your code here

class Coordinate(object):
    """ A coordinate made up of an x and y numerical value """

    def __init__(self, x, y):
        """ Sets the x and y values """
        self.x = x
        self.y = y

    def distance(self, other):
        """ Returns the euclidean distance between two Coordinate objects """
        x_diff_sq = (self.x - other.x) ** 2
        y_diff_sq = (self.y - other.y) ** 2
        return (x_diff_sq + y_diff_sq) ** 0.5

    def __str__(self):
        """ Returns the string print should show for this coordinate """
        # Build and return that string.
        return ""  # your code here

Python runs in your browser

⌘/Ctrl + Enter runs

`Coordinate` still defines a `__str__` of its own

`__str__` returns a string, and not the empty one

shows the coordinate in exactly the form asked for

reads the two values off the object

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class Coordinate(object): """ A coordinate made up of an x and y numerical value """ def __init__(self, x, y): """ Sets the x and y values """ self.x = x self.y = y def distance(self, other): """ Returns the euclidean distance between two Coordinate objects """ x_diff_sq = (self.x - other.x) ** 2 y_diff_sq = (self.y - other.y) ** 2 return (x_diff_sq + y_diff_sq) ** 0.5 def __str__(self): """ Returns the string print should show for this coordinate """ # Build and return that string. return "" # your code here

The __str__ Method: You Decide What print Shows

You decide what print shows

The __str__ Method: You Decide What print Shows

You decide what print shows

The str Method: You Decide What print Shows

You decide what `print` shows

The str Method: You Decide What print Shows

You decide what `print` shows